The Pre-socratics began the philosophical period. Which of the following does not characterize this period?

1.The lensing of a distant quasar is produced by ________ of a foreground galaxy.

1.A merger between a small elliptical galaxy and a large spiral galaxy will most likely result in

1.The pregalactic blobs had masses similar to

1.Galaxies evolve by

1.Astronomers believe that a spiral galaxy may form

1.Active galaxies are having their central engines temporarily fed by what occurrence?

1.The further away a galaxy is

1.What is true of spiral galaxies?

1.What is the Great Wall?